This is, in my opinion, how you make a medley game. The screen picks are all completely differentfrom each other in style and feel, so you get a lot of variation. There's even some mini avoidances thrown in. The bosses and the final stage have some incredible visuals.
The bosses do have some attacks that can get undodgeable, but it's usually only 1 attack and it's pretty early on all of them. That's probably the only complaint I have.
The game is not too long either.

This game is so incredibly well made with lots of variety, lots of content, great music and amazing bosses. Pretty much all of the screens in the game have something going for them.
There are some questionable decisions like the mirror puzzle and some boss attacks that are undodgeable unless you know it's coming. But it's definitely one of the best fangames I've ever played. You can really tell a lot of work was put into this.

Incredibly well made game. Starts off easy and then keeps getting harder without ever being unfair in difficulty. It's varied, long, with good design, and all of the gimmicks are well made. There is even an AI talking to you, which has some pretty funny dialogue.
This is a game everyone needs to play.